Update: Just went outside and had a chance to open the NVA axle boot. It didn't actually break but instead the inner yoke rides inside the outer housing cup and attaches to the axle shaft via splines on that shaft. The whole race backed out of the cup and off the splines so the outer cup that attaches to the stub shaft could just spin freely. I was able to push it all back together and it is solid.
It just seems like a bad design. Nothing is there, like a retaining clip, to keep from backing out and the cup doesn't seem to have any angle to slots the yoke bearings slide into to help it keep the yoke seated as deep as possible. Definitely not how I would have designed the axle.
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- Jeff 
Drift Z: 2010 370z, TopGun Rotrex Supercharger, ID 1300cc Injectors, FI Long Tube Headers, GReddy RS-Race Single Exit, Setrab PS & Oil Cooler, BC Racing BR Coilovers, CJM S1.SE Fuel System, Walbro 525 pump with the CJM Billet Fuel Hat, OS Giken Superlock 1.5
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